centos下的nc是「netcat」的簡稱,是網路工具,可以用於連接埠掃描、檔案傳輸等,nc也可以實現任意TCP和UDP連接埠的偵聽,可以利用「yum install nc -y”指令進行安裝。
本文操作環境:centos 7系統、Dell G3電腦。
nc是netcat工具的簡稱,網路工具,可以用來連接埠掃描、檔案傳輸等功能。
centos上面安裝也很簡單:
yum install nc -y
nc常用功能
實作任意TCP /UDP連接埠的偵聽,nc可以作為server以TCP或UDP方式偵聽指定連接埠
連接埠的掃描,nc可以作為client發起TCP或UDP連線
#機器之間傳送檔案
機器之間網路測速
一般nc只用來做TCP/UDP協定的連接埠測試,其它功能少用!
nc幫助說明
# nc --help Ncat 7.50 ( https://nmap.org/ncat ) Usage: ncat [options] [hostname] [port] Options taking a time assume seconds. Append 'ms' for milliseconds, 's' for seconds, 'm' for minutes, or 'h' for hours (e.g. 500ms). -4 Use IPv4 only -6 Use IPv6 only -U, --unixsock Use Unix domain sockets only -C, --crlf Use CRLF for EOL sequence -c, --sh-exec <command> Executes the given command via /bin/sh -e, --exec <command> Executes the given command --lua-exec <filename> Executes the given Lua script -g hop1[,hop2,...] Loose source routing hop points (8 max) -G <n> Loose source routing hop pointer (4, 8, 12, ...) -m, --max-conns <n> Maximum <n> simultaneous connections -h, --help Display this help screen -d, --delay <time> Wait between read/writes -o, --output <filename> Dump session data to a file -x, --hex-dump <filename> Dump session data as hex to a file -i, --idle-timeout <time> Idle read/write timeout -p, --source-port port Specify source port to use -s, --source addr Specify source address to use (doesn't affect -l) -l, --listen Bind and listen for incoming connections -k, --keep-open Accept multiple connections in listen mode -n, --nodns Do not resolve hostnames via DNS -t, --telnet Answer Telnet negotiations -u, --udp Use UDP instead of default TCP --sctp Use SCTP instead of default TCP -v, --verbose Set verbosity level (can be used several times) -w, --wait <time> Connect timeout -z Zero-I/O mode, report connection status only --append-output Append rather than clobber specified output files --send-only Only send data, ignoring received; quit on EOF --recv-only Only receive data, never send anything --allow Allow only given hosts to connect to Ncat --allowfile A file of hosts allowed to connect to Ncat --deny Deny given hosts from connecting to Ncat --denyfile A file of hosts denied from connecting to Ncat --broker Enable Ncat's connection brokering mode --chat Start a simple Ncat chat server --proxy <addr[:port]> Specify address of host to proxy through --proxy-type <type> Specify proxy type ("http" or "socks4" or "socks5") --proxy-auth <auth> Authenticate with HTTP or SOCKS proxy server --ssl Connect or listen with SSL --ssl-cert Specify SSL certificate file (PEM) for listening --ssl-key Specify SSL private key (PEM) for listening --ssl-verify Verify trust and domain name of certificates --ssl-trustfile PEM file containing trusted SSL certificates --ssl-ciphers Cipherlist containing SSL ciphers to use --version Display Ncat's version information and exit
TCP監聽測試
nc可作為server端192.168.10.11啟動一個tcp的監聽
nc -l 80
客戶端測試方法:直接telnet該機器ip 埠
telnet 192.168.10.11 80
或:nmap 192.168.10.11 -p 80
UDP監聽測試
#nc作為server端啟動一個udp的監聽
nc -lu 80
透過netstat可以看到udp協定已經監聽:
> # netstat -tunlp Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name udp 0 0 0.0.0.0:80 0.0.0.0:* 15401/nc
推薦教學:《centos教學》
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